Power electronic transformer and starting control method thereof

Abstract

The invention discloses a power electronic transformer and a starting control method thereof. The power electronic transformer comprises a power grid side converter and an isolation type direct current converter, the alternating current input end of the power grid side converter is connected with an alternating current side starting circuit, and the direct current output end is connected with the direct current input end of the isolation type direct current converter; the direct current output end of the isolated direct current converter is connected with the direct current side starting circuit; the AC side starting circuit comprises an input end and an output end, the input end is connected with an AC power grid, and the output end is connected with the AC input end of the power electronic transformer; the direct-current side starting circuit comprises an input end and an output end, the input end is connected with the direct-current output end of the power electronic transformer, and the output end is connected with a direct-current power grid or a load. According to the invention, the starting circuit of the power electronic transformer and the self equipment are sequentially controlled, so that the cost and land occupation of complete equipment are reduced, the problem of flexible starting control of the power electronic transformer is solved, and the power electronic transformer has practical engineering value.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and in particular relates to a power electronic transformer and a starting control method thereof. Background technique [0002] Power electronic transformers have been used in new energy power generation, energy storage, locomotive traction and other fields. Due to the use of high-frequency power electronic technology, the weight and volume of the equipment are greatly reduced, and at the same time, more flexible voltage conversion and energy bidirectional transfer function. With the rapid development of AC-DC hybrid distribution network, power electronic transformers have more and more extensive application prospects. [0003] Since there are power sources in both the AC grid and the DC grid in the application scenario, the power electronic transformer must have a flexible bidirectional start function. In addition, since there is no active power source on the DC side of the c...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to solve the problems of high cost, large volume and high design difficulty in the prior art, the present invention provides a power electronic transformer and its start-up control method

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